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      Java enum常见的用法
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        <h3 id="一-常量定义"><a href="#一-常量定义" class="headerlink" title="一,常量定义"></a>一,常量定义</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> WeekDay &#123;</span><br><span class="line">    SUN, MON, TUE, WED, THT, FRI, SAT</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="二-swich"><a href="#二-swich" class="headerlink" title="二,swich"></a>二,swich</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> WeekDay &#123;</span><br><span class="line">    SUN, MON, TUE, WED, THT, FRI, SAT</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SelectDay</span></span>&#123;</span><br><span class="line">    WeekDay weekday = WeekDay.SUN;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">select</span><span class="params">()</span></span>&#123;</span><br><span class="line">        <span class="keyword">switch</span>(weekday)&#123;</span><br><span class="line">            <span class="keyword">case</span> SUN:</span><br><span class="line">                weekday = WeekDay.SUN;</span><br><span class="line">                bread;</span><br><span class="line">            ...</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="三-向枚举添加新方法"><a href="#三-向枚举添加新方法" class="headerlink" title="三,向枚举添加新方法"></a>三,向枚举添加新方法</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Color &#123;  </span><br><span class="line">    RED(<span class="string">"红色"</span>, <span class="number">1</span>), GREEN(<span class="string">"绿色"</span>, <span class="number">2</span>), BLANK(<span class="string">"白色"</span>, <span class="number">3</span>), YELLO(<span class="string">"黄色"</span>, <span class="number">4</span>);  </span><br><span class="line"></span><br><span class="line">    <span class="comment">// 成员变量  </span></span><br><span class="line">    <span class="keyword">private</span> String name;  </span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> index;  </span><br><span class="line"></span><br><span class="line">    <span class="comment">// 构造方法  </span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Color</span><span class="params">(String name, <span class="keyword">int</span> index)</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">this</span>.name = name;  </span><br><span class="line">        <span class="keyword">this</span>.index = index;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">    <span class="comment">// 普通方法  </span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> String <span class="title">getName</span><span class="params">(<span class="keyword">int</span> index)</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">for</span> (Color c : Color.values()) &#123;  </span><br><span class="line">            <span class="keyword">if</span> (c.getIndex() == index) &#123;  </span><br><span class="line">                <span class="keyword">return</span> c.name;  </span><br><span class="line">            &#125;  </span><br><span class="line">        &#125;  </span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">null</span>;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">    <span class="comment">// get set 方法  </span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getName</span><span class="params">()</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">return</span> name;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setName</span><span class="params">(String name)</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">this</span>.name = name;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">int</span> <span class="title">getIndex</span><span class="params">()</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">return</span> index;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setIndex</span><span class="params">(<span class="keyword">int</span> index)</span> </span>&#123;  </span><br><span class="line">        <span class="keyword">this</span>.index = index;  </span><br><span class="line">    &#125;  </span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="四-覆盖枚举方法"><a href="#四-覆盖枚举方法" class="headerlink" title="四,覆盖枚举方法"></a>四,覆盖枚举方法</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Color &#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    RED(<span class="string">"红色"</span>, <span class="number">1</span>), GREEN(<span class="string">"绿色"</span>, <span class="number">2</span>), BLANK(<span class="string">"白色"</span>, <span class="number">3</span>), YELLO(<span class="string">"黄色"</span>, <span class="number">4</span>); </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 成员变量</span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> String name; <span class="keyword">private</span> <span class="keyword">int</span> index; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 构造方法 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Color</span><span class="params">(String name, <span class="keyword">int</span> index)</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        <span class="keyword">this</span>.name = name; <span class="keyword">this</span>.index = index; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//覆盖方法 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span> </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">toString</span><span class="params">()</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">this</span>.index+<span class="string">"_"</span>+<span class="keyword">this</span>.name; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="五-实现接口"><a href="#五-实现接口" class="headerlink" title="五,实现接口"></a>五,实现接口</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Behaviour</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">void</span> <span class="title">print</span><span class="params">()</span></span>; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function">String <span class="title">getInfo</span><span class="params">()</span></span>; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">enum</span> Color implements Behaviour&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    RED(<span class="string">"红色"</span>, <span class="number">1</span>), GREEN(<span class="string">"绿色"</span>, <span class="number">2</span>), BLANK(<span class="string">"白色"</span>, <span class="number">3</span>), YELLO(<span class="string">"黄色"</span>, <span class="number">4</span>); </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 成员变量 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> String name; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> index; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">// 构造方法 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="title">Color</span><span class="params">(String name, <span class="keyword">int</span> index)</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        <span class="keyword">this</span>.name = name; <span class="keyword">this</span>.index = index; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//接口方法 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span> </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> String <span class="title">getInfo</span><span class="params">()</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        <span class="keyword">return</span> <span class="keyword">this</span>.name; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="comment">//接口方法 </span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span> </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">print</span><span class="params">()</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="keyword">this</span>.index+<span class="string">":"</span>+<span class="keyword">this</span>.name); </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="六-接口组织枚举"><a href="#六-接口组织枚举" class="headerlink" title="六,接口组织枚举"></a>六,接口组织枚举</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">Food</span> </span>&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">enum</span> Coffee implements Food&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        BLACK_COFFEE,DECAF_COFFEE,LATTE,CAPPUCCINO </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">enum</span> Dessert implements Food&#123; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        FRUIT, CAKE, GELATO </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125; </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="七-枚举集合"><a href="#七-枚举集合" class="headerlink" title="七,枚举集合"></a>七,枚举集合</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>&#123;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        EnumSet&lt;WeekDay&gt; week = EnumSet.noneOf(WeekDay<span class="class">.<span class="keyword">class</span>)</span>;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        week.add(WeekDay.MON);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="string">"EnumSet中的元素："</span> + week);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        week.remove(WeekDay.MON);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="string">"EnumSet中的元素："</span> + week);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        week.addAll(EnumSet.complementOf(week));</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="string">"EnumSet中的元素："</span> + week);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        week.removeAll(EnumSet.range(WeekDay.FRI, WeekDay.SAT));</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        System.out.println(<span class="string">"EnumSet中的元素："</span> + week);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>


      
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